package collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;

public class CollectionDemo2 {
    public static void main(String[] args) {
        Collection c = new ArrayList();
//        Collection c = new HashSet();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,10));
        c.add(new Point(3,4));


        System.out.println(c);

        Point p = new Point(1,2);
        /*
        对于Set集合而言，重复的元素无法存入第二次
        当然，这需要元素妥善的重写了equals方法
        */
        c.add(p);
        System.out.println(c);

        Point p2 = new Point(3,4);

        boolean contains = c.contains(p2);
        System.out.println("是否包含给定元素"+contains);

        c.remove(p2);
        System.out.println(c);


    }


}
